For ps2, there is no "fill all motives" cheat but there is a money cheat this it.

10,000 additional Simoleons

Enable the "Cheat Gnome" code, then press Up, Left, Down, Right, R1 while playing the game. An option to advance time by six hours will now appear on the Cheat Gnome. Select the Cheat Gnome, press Up, Left, Down, Right, R1for a second time. . Press Up, Left, Down, Right, R1 for a third time. A "Give Sim Simoleons" option should now appear.

Pet Points

Enable the "Cheat Gnome" code, then press Triangle, Circle, X, Square, L1, R1 while playing the game. A "Pet Points" option will now appear on the Cheat Gnome.